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Warrants Issued and Outstanding (Detail) (USD $)
9 Months Ended
Sep. 30, 2013
Warrants Outstanding Number of underlying shares  
Beginning Balance 283,956
Granted / Vested 0
Forfeited 0
Exercised (28,348)
Ending Balance 255,608
Warrants Outstanding Weighted Average Exercise Price  
Beginning Balance $ 3.63
Exercised $ 3.50
Ending Balance $ 3.64
Warrants Outstanding Average Remaining Contractual Life (yrs)  
Beginning Balances 10 months 28 days
Ending Balance 2 months 5 days
Warrants Exercisable Number of underlying shares  
Beginning Balance 283,956
Ending Balance 255,608
Warrants Exercisable Weighted Average Exercise Price  
Beginning Balance $ 3.63
Ending Balance $ 3.64
Warrants Exercisable Average Remaining Contractual Life (yrs)  
Beginning Balance 10 months 28 days
Ending Balance 2 months 5 days